[2][3] In 2021, Duggan moved to the United States to attend college, initially set to attend Francis Marion University, however, due to not meeting certain academic requirements, he was deemed ineligible and instead transferred to Iowa Lakes Community College.
[4] He helped Iowa Lakes win the 2021 Midwest District Championship and was named an All-Region Honorable Mention.
[15] In July 2021, he returned to Kirchheimer SC briefly, before heading to college in the United States.
[18][19] He initially missed the start of training camp with the club, due to visa issues, but was eventually able to arrive.
[22] He made his Major League Soccer debut for the first team on 8 June against FC Dallas.